Expansion-valve.



No. 353.503; PATENTED MAY 14, 1907.

A. H. EDDY.

EXPANSION VALVE.

APPLICATION FILED JAN. 6, 1906.

UNITED STATES PATENT OFFICE.

ARTHUR H. EDDY, OF WINDSOR, CONNECTICUT, ASSIGNOR OF ONE-HALF TO CHARLES E. SHEPARD, HARTFORD, CONNECTICUT.

EXPANSlON-VALVE.

N0. ersasoe.

Specification of Letters Patent.

Patented May 14,' 1907.

- Application filed January 6, 1906. Serial No. 294,875.

To all whom it may concern.-

Be it "known that I, ARTHUR H. EDDY, a citizen of the United States, residing at Windsor, in the county of Hartford and State of Connecticut, have invented a new and useful Expansion-Valve, of which the following is a specification.

This invention relates to a valve which is particularly de'signedfor use in a refrigeratmg system for controlling the flow according to the pressure of such a penetrating fluid as ammonia, although the valve which embodies this invention is applicable to other uses.

The object of this invention is to provide a comparatively simple, easily constructed valve for this purpose which will operate to control the flow of fluid according to the relative pressures on opposite sides. of the valve and also according to the temperature of the fluid which flows through the valve or templergture of a liquid which isaflected by that The accompanying drawing shows a central lo itudinal section of a valve that embodies lile invention.

The body 1 of the valve shown is referably cast to shape with an end 2 for the attachment of the inlet pipe and an end 3 for the attachment of the outlet pipe. In the bod is a lining 4 fitting which is-a plunger 5 whic has a circumferential roove 6 near one end and passages 7 from t e groove to the other end; At one end the plunger is connected with a valve 8 which is adapted to shut against a seat 9. This valve and the plunger are fastened to a small diaphragm 10 that is held in the body by a plug 11. At the other end the plunger is fastened to a large diaphragm 12. When the valve is open fluid flows from the inlet passage 13 'ast the valve and leaks by the plun or to t eoutlet passage 14. When the va ve is closed no fluid can escape in this way. Thrusting a ainst the large diaphragm'is a spring 15.

a block 16 that is carried by the end of a toggle 17. The center of the toggle isconnectedby a link 18 With a' double diaphragm 19 which by a pipe 20 is connected with a receptacle 21 that is designed to be laced in theliquid the temperature of-whic is to be utilized for influencin the flow of fluid through this valve. e lower end of the lie'lower end of this spring is supported on toggle isadapted to thrust a ainst an adusting screw 22 which may lee turned to regulate the angularity of the to gle and consequently the lnitial tension 0 the spring that thrusts against the large diaphragm. The link which connects the dia hra m with the toggle may be provided wit a t eaded post 23 and a thumb nut-24 which may be adjusted to determine the bend of'the to gle and amount of contraction of the double 31aphragm. On the post and thrusting between the adjusting nut 26 and the frame 27 is-a s ring '28 which acts in conjunction with the. oub e diaphragm, that is, it tends to counteract the tension of the spring 15, and thus render the double diaphragm more sensitive.

The receptacle 21 may contain any ex ansible substance which when warm wil expand the diaphragm and straighten the toggle and when cooled will contract the dia phragm and bend the toggle. The tension of the sprin plunger diap a m is determined by t angle of the togg e and the angle of the to gle is controlled by the state of the doub e diaphragm which is regulated by the temperature of the substance in the receptacle.

The construction of the valve is immaterial to this invention. ..The valve shown in the drawing in order to illustrate the invention, is one designed to control the flow of this valve and regulating device are used in a refrigerating plant for controlling the ,flow of ammonia as the pressure on. the outlet side of the valve rises suflicientlyi to by exertion on the lar e dia hragm thrust back the spring and rawn own the lunger the valve is closed so that nomore fluid can flow. vWhen the ressure on the outlet side drops suflicien y the spring thrusting against the diahragm lifts the plunger and valve so that fluid may fiow from the inlet through the valve past the plunger to the outlet.

In a refrigerating plant it is not only desirable to regulate the flow of the fluid according to the relative pressures on the inlet and outlet sides of the expansion valve so that the device will act automaticall but it is also desirable as the temperature ecomes reduced to have the devlce operate .with greater relative pressures between the inlet and outlet sides of the expansion valve. In

thrusting against the large ammonia in refrigerating plants. When As the brine warms the fluid in the receptacle 1 expands the double diaphragm and straightens the toggle so as to stillen the spring and this )erates to permit the flow of ammonia with l ess relative pressure between the inlet and outlet sides because the pressure on the expansion side under these circumstances must be higher than before to effect the closing of the valve. In practice the valve does not continually open andshut, the conditions automatically become stable according to the pressure and temperature but by the em ployment of this construction the expansion pressure drops as the temperature drops and consequently increases the efiiciency of the ap aratus.

he invention claimed is p 1. A regulating device having a body with an inlet, an outlet and a valve seat, a valve ada ted to open and close against the seat, a diap iragm connected with and adapted to close the valve, a spring arranged to open the valve, and a hollow thermostatic diaphragm connected with and arranged to control the tension of the s ring according to the thermostatic condit1on of the diaphragm, substantially as specified.

2. A regulating device having a body with an inlet, an outlet, and a valve seat, a plun: ger located on theoutlet side of the valve seat, a valve located on the inlet side of the valve seat and connected with the lunger, a diaphragm connected with the p unger on 1 the outlet side of the valve seat, a spring thrusting against the diaphragm, and'a diaphragm connected with the spring whereby the tension of the sprin Y is regulated by the condition of. the latter diaphragm, substantially as specified.

3. A regulating device having a body with an inlet, an outlet and a valve seat, a plunger located on the outlet side of the valve seat, a valve located on the inlet side of the valve seat and connected with the plunger, a diaphragm on the inlet side of the valve seat and connected with the valve, a diaphra m on the outlet side of the valve seat an 'connected with the plunger, a spring thrusting against the diaphragm on the outlet side of the valve seat, and an expansible dia hragm arranged ltO control the tension of sai spring substantially as specified.

4. A regulating device having a body with an inlet 'and outlet and a valve seat, a valve movable toward and from the valve seat, a hollow thermostatic diaphragm, and a spring thrusting between the valve and the thermostatic dlaphragm and tending to lift the valve from its seat and having its tension varied according to the state ofthe said diaphragm, substantially as specified.

I 5. A regulating device having a body with.

an inlet, an outlet and a valve seat, a valve movable toward and from the valve seat, a spring arranged to thrust the valve from the valve seat, a .toggle sup orting-the spring, and a thermostatic diap agm adapted to actuate the toggle, substantially as specified.

6. In combmation with a valve, a dia ghragm arrangedto move the valve in one irection, a spring arranged to move the valve inthe o posite direction, and a hollow thermostatic laphragm connected with and arranged to control the tension of the spring, substantially as specified.

' ARTHUR H. EDDY. Witnesses:

H. R. WILLIAMS, E. M. Lows. 

